Bede's Ecclesiastical History of England, ed. by A.M. Sellar, , at sacred-texts.com
Thus far the answers of the holy Pope Gregory, to the questions of the most reverend prelate, Augustine. Now the letter, which he says he had written to the bishop of Aries, was directed to Vergilius, successor to Aetherius, and was in the following words:
"To his most reverend and holy brother and fellow bishop, Vergilius; Gregory, servant of the servants of God. With how much kindness brethren, coming of their own accord, are to be entertained, is shown by this, that they are for the most part invited for the sake of brotherly love. Therefore, if our common brother, Bishop Augustine, shall happen to come to you, let your love, as is becoming, receive him with so great kindness and affection, that it may refresh him by the benefit of its consolation and show to others how brotherly charity is to be cultivated. And, since it often happens that those who are at a distance first learn from others the things that need correction, if he bring before you, my brother, any sins of bishops or others, do you, in conjunction with him, carefully inquire into the same, and show yourself so strict and earnest with regard to those things which offend God and provoke His wrath, that for the amendment of others, the punishment may fall upon the guilty, and the innocent may not suffer under false report. God keep you in safety, most reverend brother. Given the 22nd day of June, in the nineteenth year of the reign of our most religious lord, Mauritius Tiberius Augustus, the eighteenth year after the consulship of our said lord, and the fourth indiction."